Buggy code:
public class LWC { public static boolean ENABLED = false ; private static LWC instance ; private Configuration configuration ; private final ModuleLoader moduleLoader ; private final JobManager jobManager ; private final ProtectionCache protectionCache ; private Logger logger = Logger . getLogger ( "LWC" ) ; private PhysDB physicalDatabase ; private LWCPlugin plugin ; private DatabaseThread databaseThread ; private IPermissions permissions ; private ICurrency currency ; public LWC ( LWCPlugin plugin ) { } public static LWC getInstance ( ) { } public static String materialToString ( int id ) { } private static String materialToString ( Material material ) { } private static String normalizeName ( Material material ) { } public void adjustChestDirection ( Block block , BlockFace face ) { } public Block findAdjacentDoubleChest ( Block block ) { } public boolean canAccessProtection ( Player player , Block block ) { } public Protection findProtection ( Block block ) { } public boolean canAccessProtection ( Player player , int x , int y , int z ) { } public boolean canAdminProtection ( Player player , Block block ) { } public boolean canAdminProtection ( Player player , Protection protection ) { } public void completeStopwatch ( StopWatch stopWatch , Player player ) { } public Map < Integer , ItemStack > depositItems ( Block block , ItemStack itemStack ) { } public Block findAdjacentBlock ( Block block , Material material , Block ... ignore ) { } public void destruct ( ) { } private void log ( String str ) { } public String encrypt ( String text ) { } public boolean enforceAccess ( Player player , Protection protection , Block block ) { boolean hasAccess = canAccessProtection ( player , protection ) ; if ( ( block == null ) || ( protection == null ) ) { return true ; } <START_BUG> if ( ( block != null ) && ( ( ( protection . getBlockId ( ) ) == 0 ) || ( ( block . getTypeId ( ) ) != ( protection . getBlockId ( ) ) ) ) ) { <END_BUG> protection . setBlockId ( block . getTypeId ( ) ) ; protection . save ( ) ; } if ( ( block != null ) && ( ( ( protection . getWorld ( ) ) == null ) || ( ! ( block . getWorld ( ) . getName ( ) . equals ( protection . getWorld ( ) ) ) ) ) ) { protection . setWorld ( block . getWorld ( ) . getName ( ) ) ; protection . save ( ) ; } if ( hasAccess ) { long timestamp = ( System . currentTimeMillis ( ) ) // 1000L ; protection . setLastAccessed ( timestamp ) ; protection . save ( ) ; } if ( configuration . getBoolean ( "core.showNotices" , true ) ) { boolean isOwner = protection . isOwner ( player ) ; boolean showMyNotices = configuration . getBoolean ( "core.showMyNotices" , true ) ; if ( ( ( isAdmin ( player ) ) || ( isMod ( player ) ) ) || ( isOwner && showMyNotices ) ) { String owner = protection . getOwner ( ) ; if ( owner . equals ( player . getName ( ) ) ) { owner = getLocale ( "you" ) ; } String blockName = LWC . materialToString ( block ) ; if ( ! ( getLocale ( ( ( "protection." + ( blockName . toLowerCase ( ) ) ) + ".notice.protected" ) ) . startsWith ( "UNKNOWN_LOCALE" ) ) ) { sendLocale ( player , ( ( "protection." + ( blockName . toLowerCase ( ) ) ) + ".notice.protected" ) , "type" , getLocale ( protection . typeToString ( ) . toLowerCase ( ) ) , "block" , blockName , "owner" , owner ) ; } else { sendLocale ( player , "protection.general.notice.protected" , "type" , getLocale ( protection . typeToString ( ) . toLowerCase ( ) ) , "block" , blockName , "owner" , owner ) ; } } } switch ( protection . getType ( ) ) { case PASSWORD : if ( ! hasAccess ) { sendLocale ( player , "protection.general.locked.password" , "block" , LWC . materialToString ( block ) ) ; } break ; case PRIVATE : case DONATION : if ( ! hasAccess ) { sendLocale ( player , "protection.general.locked.private" , "block" , LWC . materialToString ( block ) ) ; } break ; case TRAP_KICK : if ( ! hasAccess ) { player . kickPlayer ( protection . getPassword ( ) ) ; log ( ( ( ( player . getName ( ) ) + "<seq2seq4repair_space>triggered<seq2seq4repair_space>the<seq2seq4repair_space>kick<seq2seq4repair_space>trap:<seq2seq4repair_space>" ) + ( protection . toString ( ) ) ) ) ; } break ; case TRAP_BAN : if ( ! hasAccess ) { Plugin mcbansPlugin ; if ( ( mcbansPlugin = plugin . getServer ( ) . getPluginManager ( ) . getPlugin ( "MCBans" ) ) != null ) { mcbans mcbans = ( ( mcbans ) ( mcbansPlugin ) ) ; mcbans . mcb_handler . ban ( player . getName ( ) , "LWC" , protection . getPassword ( ) , "" ) ; } log ( ( ( ( player . getName ( ) ) + "<seq2seq4repair_space>triggered<seq2seq4repair_space>the<seq2seq4repair_space>ban<seq2seq4repair_space>trap:<seq2seq4repair_space>" ) + ( protection . toString ( ) ) ) ) ; } break ; } return hasAccess ; } public boolean canAccessProtection ( Player player , Protection protection ) { } public boolean isMod ( Player player ) { } public boolean isAdmin ( Player player ) { } public boolean hasPermission ( Player player , String node ) { } public LWCPlayer wrapPlayer ( CommandSender sender ) { } public String getLocale ( String key , Object ... args ) { } private Map < String , Object > parseBinds ( Object ... args ) { } public void sendLocale ( CommandSender sender , String key , Object ... args ) { }

Fix:
if ( ( block != null ) && ( ( ( protection . getBlockId ( ) ) <= 0 ) && ( ( block . getTypeId ( ) ) != ( protection . getBlockId ( ) ) ) ) ) {